The most important component required for transmission lines are

1. poles and towers 
2. conductors
3. insulators
4. poles, towers, conductors, and insulators

Answer: D. poles, towers, conductors, and insulators

Explanation: 
Transmission Lines are made up of various components, namely poles, lattice structures, conductors, cables, insulators, foundations, and earthing systems. The primary functions of transmission line structures are to provide mechanical support to conductors.





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